100 overdrive question

[curtis]

I have had an oil leak from the gearbox for sometime in my BN2 (four speed).I decided to look at it and guess that there must be a problem with the first motion shaft seal which would then manifest itself with drips through the bottom of the front gearbox casing?
However there is also a leak from the overdrive where the setting lever goes into the casing. That's the lever on the shaft with the solenoid lever on the other end.
My question is. How easy is it to replace this little seal?
Can you remove the setting lever and then access the seal. Hooking it out?
Can you slide the valve opening shaft across leaving the seal free to be extracted? If you do pull it across a little will it go back into position afterwards?

Thanks in advance.

 

[curtis]

Just following on from the above. Bearing in mind the positioning of the little seal would it be possible for a lot of oil to escape via this route? In other words from full to off the bottom of the dipstick. Is that part of the overdrive pressurized?

 

[Stretch]

The lever is held in place with a roll pin. Punch it out and wiggle the lever off. The seal is an o ring. Easy to pick out and replace once the lever is off. I replaced mine with the tranny out. Don't know about being able to punch out the pin with the O drive in the chassis. No oil pressure behind it; the lever hold it in place.

 

[curtis]

Thanks for that Stretch.
Any thoughts about the amount of oil that could escape via this seal. Once the level had dropped a bit would it still come out?

 

[Keoke]

Hi Curtis, Stretch gave you some good advice I never gave it much thought before. If the seal is leaking it will continue to leak until the head of oil in the case rests below the shaft. The leak rate will continuously decrease as the head recedes.---Fwiw--Keoke

 

[curtis]

That's what I thought so it must be getting out somewhere else. Hmmm.